Magnetic flux density measurement through phase decomposition using non‐interleaved scan in MREIT

Abstract

Magnetic resonance electrical impedance tomography (MREIT) measures the z-component of magnetic flux density B = (Bx, By, Bz) induced by externally injected current through a pair of electrodes. MREIT visualises in-vivo electrical current density and/or conductivity distribution in a three-dimensional imaging object from the measured magnetic flux density Bz. MREIT techniques typically use the phase difference approach in an interleaved encoding scheme by the injection of positive and negative currents to cancel systematic phase artefacts. Developed is a method to measure Bz data using only a single scan by the injection of one current, avoiding the interleaved encoding scheme. The method separates measured multiple k-space lines into acquired k-space lines with and without injection currents and develops an algorithm to measure the magnetic flux density Bz using acquired k-space lines by the injecting current. Results from phantom experiments demonstrate that the method has potential to measure magnetic flux density using only a single scan by the injection of one current.